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' 1,623,074 April 1927' E. H. TARTRAIS FUEL SUPPLY MEANS FOR HEAVY OIL ENGINES I Filed March 7. 1924 EUGENE mum: TARTRAIS I"- HTR:

Lg Q BY 111s ATTORNEY.

Patented 5, 192 7.

UNITED .STATES PATENT OFFICE.

anemia mar TL'B'IMIB, or persons-annual; mam.

roan-sunny MEANS roa Heavy-on. enemas.

Application filed larch 7, 1924, Serial No. 687,515, and in Iranee Inch 14, 18.

My invention has for its object an arrangement for preventin the formation of gas bubbles Within the llquid fuel which is supplied toheavy oil engines by injection pumps. The gas bubbles are formedwithin the liquid fuel itself when the latter comes into contact with the hot or even the warm parts of the engine, and they consist of volatile hydrocarbon gas. This effect is chiefobserved in the case of certain fuels whose fi uidity is insufficient and which must be preheated. I

The apparatus according to the invention comprises a receptacle which is so disposed as to be heated for instance by the cooling water of the engine, and which forms part of a circuit comprising the main fuel tank and a circulating pump, the said receptacle being provided at its upper part with an outlet valve urged upon its seat by a calibrated spring, the feed pipe of the injection pump opening laterally into the said receptacle. Any gases which maybe contained in the liquid fuel are discharged within the receptacle by the action of heat, and will return together with the excess of li uid to the main fuel tank, while the fuel de ivered to the in'ection pump is entirely freedfrom gas. Ot er features and advantages of the invention will be disclosed in the following description:

The appended drawing shows by way of example an embodiment of the invention as ap lied to the engine of a motor vehicle.

ig. 1 is a front view of the engine.

Fi 2 is a vertical section of the preheating x.

1 is the main fuel tank, which is disposed at the rear of the vehicle. The pipe 2 extending from the bottom of the said tank constitutes the suction ipe of the circulating pump 3 which is driven by the engine 4;

and may be of the gearing or the paddle type. 5 is the discharge pipe of the said ump; the fuel issuing throu h said fpipe sows throu h the central cham r 6 o t e preheating box 6, (Fig. 2). The fuel passes through a removable filter 7 and is discharged along with the gas through the valve 8 urged upon its seat by the spring 9, and returns thence through'the pipe 14 to the top of the tank 1.

The chamber 6' is surrounded by a hot water jacket provided with the pipes 17 18 and in which the cooling water .of the engine is caused to circulate. is the raand due to the diator of the engine, 16 the water pump and 15} the radiator return tube. The suction pipe 13 of the injection pump 12 is connected with the conduit 11 situated at one side of the saidpreheating box. 20 and 21, (Fig. 1 are the discharge pipes of the said inject1on pump.

During the operation, the liquid fuel is forced through the said preheating box by the pump 3, while .at the same time the injection pump withdraws from the said box a certain amount of fuel through the conduit 11 and delivers it to the engine through the tubes 20 and 21. By reason of the heat prevailing in the'said box, all ases contained in the liquid fuel will be ischargecl position of the pi es 11, the gas bubbles wil escape preferab y through the valve 8 located at the upper part of said box, and will thus return through the pipe .14 to the main fuel tank 1 together with the formation of bubbles, or at least reduces the volume of the same to a great extent; at all events, the operating conditions are found to be much improved. This effect also facilitates the supply of liquid to the amp and thus increases the out ut of the atter.

In the particular case 0 a motor vehicle in which the main fuel tank is situated at the rear and at a low level, the auxiliary pump 3 withdraws fuel directly from the tank, as observed, and this will dispense with the use of fuel elevating or suction de vices, or the use of gas or air pressure upon the fuel.

Obviously, my said invention is not limited to the constructional forms herein represented, which are given solely by way of example.

Having now described 111 invention what I claim as new and desire o secure by Letters Patent is:

1. In combination with the fuel pump of a liquid fuel internal combustion engine, a

heated receptacle through which the fuel is caused to flow from bottom to top and according to a substantially straight path, the inlet pipe of said pump opening laterally into said receptacle and at the upper part thereof, and means for returning the surplus of fuel and the bubbles which are formed within said liquid fuel from the top of said receptacle to the fuel feed tank;

2. A'fuel feeding system for a liquid fuel internal combustion engine, comprising a fuel feed tank, a main fuel pump, a heated receptacle at the upperpart of which the inlet pipe of said fue pump opens laterally,

an auxiliary um pumping out of said tank and forcihg tie fuel. through said receptacle from bottom to top and according to a. substantiall straight ath, a return pipe connecting t e top of said receptacle to sand tank, an adjustable discharge valve on said return pipe whereby the bubbles which are formed within the liquid fuel are discharged, and means for heating said receptacle.

In testimony whereof I have signed my name to this specification.

EUGENE HENRI TARTRAIS. 

